The feedback tab
It's on the left (on a phone, the round button at the bottom left). Type, or record a voice note of up to 3 minutes.
Demo
Try it on this very page
This website runs FeedbackSuite. Whatever you send here really reaches the FeedbackSuite team.
Feedback on the screen
Talk and point at what you see with a box, circle, arrow or text. Admins see it later on the page, with the audio of each mark.
The on-screen feedback demo is coming to this page soon.